.mask {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* 半透明黑色 */
    z-index: 9999; /* 确保遮罩层在最上面 */
}
.mask.visible {
    display: block;
}

.mask-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    padding: 20px 40px;
    border-radius: 5px;
    text-align: center;
}

.mask-title {
    margin-bottom: 0.5rem;
}